JPH08216377A - Inspecting method of printing quality - Google Patents
Inspecting method of printing qualityInfo
- Publication number
- JPH08216377A JPH08216377A JP7021531A JP2153195A JPH08216377A JP H08216377 A JPH08216377 A JP H08216377A JP 7021531 A JP7021531 A JP 7021531A JP 2153195 A JP2153195 A JP 2153195A JP H08216377 A JPH08216377 A JP H08216377A
- Authority
- JP
- Japan
- Prior art keywords
- value data
- image data
- normal
- data
- detection unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
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- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
- Image Processing (AREA)
- Image Analysis (AREA)
- Inking, Control Or Cleaning Of Printing Machines (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、印刷品質検査方法に関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a print quality inspection method.
【０００２】[0002]
【従来の技術】従来の印刷品質検査方法では、図２に示
すように印刷紙面の画像データを、ｋ＝１→ｋ・・・＝
１−ｎ、ｋ＝ｎとカメラにより逐次読み込み、この画像
データの時間的平均をとって、推定値データを得る。そ
してこの推定値データと予め読み込んでおいた基準値デ
ータとを比較して、その誤差が閾値よりも大きいときに
は、欠陥画素と判定している。この判定動作のフローチ
ャートを図３に示した。2. Description of the Related Art In a conventional print quality inspection method, as shown in FIG.
1-n and k = n are sequentially read by the camera, and the temporal average of this image data is taken to obtain estimated value data. Then, the estimated value data is compared with the reference value data read in advance, and when the error is larger than the threshold value, it is determined as a defective pixel. A flowchart of this determination operation is shown in FIG.
【０００３】[0003]
【発明が解決しようとする課題】前記図２、図３に示す
従来の印刷品質検査方法では、検出精度を向上させるた
めに、現在の印刷紙面の画像データと過去の印刷紙面の
画像データとの平均値である推定値データを基準値デー
タと比較しているので、一度、欠陥が発生した場合、そ
の後の数枚分の正常画素の推定値データに過去の欠陥デ
ータの影響が出ることになって、正常画素が欠陥画素と
判定され、結果的に良質紙までもが欠陥紙として排紙さ
れてしまうという問題があった。In the conventional print quality inspection method shown in FIGS. 2 and 3, in order to improve the detection accuracy, the image data of the current printing paper surface and the image data of the past printing paper surface are combined. Since the estimated value data, which is the average value, is compared with the reference value data, if a defect occurs once, the estimated value data of the normal pixels for the subsequent several sheets will be affected by the past defect data. Then, the normal pixel is determined to be a defective pixel, and as a result, even good quality paper is discharged as a defective paper.
【０００４】本発明は前記の問題点に鑑み提案するもの
であり、その目的とする処は、欠陥紙に続く良紙の何枚
かを欠陥紙と判定する欠陥を除くことができる印刷品質
検査方法を提供しようとする点にある。The present invention has been made in view of the above problems, and an object thereof is to perform a print quality inspection capable of eliminating a defect in which some of good sheets following a defective sheet are determined as defective sheets. The point is to provide a way.
【０００５】[0005]
【課題を解決するための手段】上記の目的を達成するた
めに、本発明は、検出部のカメラにより逐次取り込まれ
る印刷紙面の画像データと、予め取り込まれている基準
値データとを比較し、印刷欠陥を検出して、印刷品質の
良否を判定する印刷品質検査方法において、検出部のカ
メラにより逐次取り込まれる印刷紙面の画像データを時
間的に平均化して推定値データを算出し、この推定値デ
ータと予め取り込まれている基準値データとを比較し
て、推定値データが正常であれば、正常画素と判断し、
異常であれば、次のステップで検出部からの画像データ
と基準値データとを比較して、検出部からの画像データ
が正常であれば、正常画素と判断し、異常であれば、欠
陥画素と判断して、紙面排紙等の処理を行うことを特徴
としている。In order to achieve the above object, the present invention compares image data of a printing paper surface sequentially captured by a camera of a detection section with reference value data captured in advance, In the print quality inspection method that detects print defects and determines whether the print quality is good or bad, the image data of the printing paper surface that is sequentially captured by the camera of the detection unit is temporally averaged to calculate estimated value data. If the estimated value data is normal by comparing the data with the reference value data that has been captured in advance, it is determined as a normal pixel,
If it is abnormal, the image data from the detection unit is compared with the reference value data in the next step. If the image data from the detection unit is normal, it is determined as a normal pixel, and if abnormal, the defective pixel is detected. It is characterized by performing processing such as paper ejection on the basis of the judgment.
【０００６】[0006]
【作用】本発明は前記のように構成されており、検出部
のカメラにより逐次取り込まれる印刷紙面の画像データ
と、予め取り込まれている基準値データとを比較し、印
刷欠陥を検出して、印刷品質の良否を判定する印刷品質
検査方法において、検出部のカメラにより逐次取り込ま
れる印刷紙面の画像データを時間的に平均化して推定値
データを算出し、この推定値データと予め取り込まれて
いる基準値データとを比較して、推定値データが正常で
あれば、正常画素と判断し、異常であれば、次のステッ
プで検出部からの画像データと基準値データとを比較し
て、検出部からの画像データが正常であれば、正常画素
と判断し、異常であれば、欠陥画素と判断して、紙面排
紙等の処理を行う。The present invention is configured as described above, and compares the image data of the printing paper surface sequentially captured by the camera of the detection unit with the reference value data previously captured, detects the printing defect, In a print quality inspection method for determining the quality of print quality, estimated value data is calculated by temporally averaging the image data on the printing paper sequentially captured by the camera of the detection unit, and this estimated value data is captured in advance. If the estimated value data is normal by comparing with the reference value data, it is judged as a normal pixel, and if abnormal, it is detected by comparing the image data from the detection unit with the reference value data in the next step. If the image data from the set is normal, it is determined to be a normal pixel, and if abnormal, it is determined to be a defective pixel, and processing such as paper ejection is performed.
【０００７】[0007]
【実施例】次に本発明の印刷品質検査方法を図１に示す
判定動作のフローチャートにより説明する。検出部のカ
メラにより印刷紙面の画像データを逐次取り込み、次い
でこの逐次取り込まれる画像データを時間的に平均化し
て推定値データを算出し、次いでこの推定値データと予
め取り込まれている基準値データとを比較して、推定値
データが正常であれば、正常画素と判断し、異常であれ
ば、次のステップで検出部からの画像データと基準値デ
ータとを比較して、検出部からの画像データが正常であ
れば、正常画素と判断し、異常であれば、欠陥画素と判
断して、紙面排紙等の処理を行う。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the print quality inspection method of the present invention will be described with reference to the flow chart of the determination operation shown in FIG. Image data on the print paper is sequentially captured by the camera of the detection unit, then the sequentially captured image data is temporally averaged to calculate the estimated value data, and then the estimated value data and the reference value data previously captured. If the estimated value data is normal, it is determined to be a normal pixel, and if abnormal, the image data from the detection unit is compared with the reference value data in the next step, and the image from the detection unit is compared. If the data is normal, it is determined to be a normal pixel, and if abnormal, it is determined to be a defective pixel, and processing such as paper ejection is performed.
【０００８】[0008]
【発明の効果】本発明の印刷品質検査方法によれば、次
の効果を達成できる。即ち、推定値データは、画像デー
タの時間的平均を求めるため、高い安定性を得られる反
面、過去の欠陥画像データの影響を受け継ぐ。他方、検
出部から取り込まれる画像データは、安定性が劣るもの
の、過去の欠陥データの影響は皆無である。これらの相
補的特質をもつ値を基準データと比較した結果の論理積
をもって良否判定を行えば、欠陥紙に続く良紙の何枚か
を欠陥紙と判定する欠陥を除くことができる。According to the print quality inspection method of the present invention, the following effects can be achieved. That is, since the estimated value data obtains the temporal average of the image data, it is possible to obtain high stability, but it is influenced by the past defective image data. On the other hand, the image data fetched from the detection unit is inferior in stability, but has no influence of past defect data. If the quality judgment is performed by the logical product of the results obtained by comparing the values having these complementary characteristics with the reference data, it is possible to exclude the defect which judges that some of the good papers following the defective paper are defective papers.
【０００９】この点、本発明の印刷品質検査方法は前記
のように検出部のカメラにより逐次取り込まれる印刷紙
面の画像データと、予め取り込まれている基準値データ
とを比較し、印刷欠陥を検出して、印刷品質の良否を判
定する印刷品質検査方法において、検出部のカメラによ
り逐次取り込まれる印刷紙面の画像データを時間的に平
均化して推定値データを算出し、この推定値データと予
め取り込まれている基準値データとを比較して、推定値
データが正常であれば、正常画素と判断し、異常であれ
ば、次のステップで検出部からの画像データと基準値デ
ータとを比較して、検出部からの画像データが正常であ
れば、正常画素と判断し、異常であれば、欠陥画素と判
断して、紙面排紙等の処理を行うので、欠陥紙に続く良
紙の何枚かを欠陥紙と判定する欠陥を除くことができ
る。In this respect, the print quality inspection method of the present invention detects the print defect by comparing the image data of the printing paper surface sequentially captured by the camera of the detection unit with the reference value data previously captured as described above. Then, in the print quality inspection method for determining the quality of the print quality, the image data of the printing paper surface sequentially captured by the camera of the detection unit is temporally averaged to calculate the estimated value data, and the estimated value data is captured in advance. If the estimated value data is normal, it is judged as a normal pixel, and if it is abnormal, the image data from the detection unit and the reference value data are compared in the next step. Then, if the image data from the detection unit is normal, it is judged as a normal pixel, and if abnormal, it is judged as a defective pixel, and processing such as paper ejection is performed. The number of defects Can be removed defective determines that.
【図１】本発明の印刷品質検査方法の判定動作のフロー
チャートである。FIG. 1 is a flowchart of a determination operation of a print quality inspection method of the present invention.
【図２】従来の印刷品質検査方法を示す説明図である。FIG. 2 is an explanatory diagram showing a conventional print quality inspection method.
【図３】同印刷品質検査方法の判定動作のフローチャー
トである。FIG. 3 is a flowchart of a determination operation of the same print quality inspection method.
Claims (1)
印刷紙面の画像データと、予め取り込まれている基準値
データとを比較し、印刷欠陥を検出して、印刷品質の良
否を判定する印刷品質検査方法において、検出部のカメ
ラにより逐次取り込まれる印刷紙面の画像データを時間
的に平均化して推定値データを算出し、この推定値デー
タと予め取り込まれている基準値データとを比較して、
推定値データが正常であれば、正常画素と判断し、異常
であれば、次のステップで検出部からの画像データと基
準値データとを比較して、検出部からの画像データが正
常であれば、正常画素と判断し、異常であれば、欠陥画
素と判断して、紙面排紙等の処理を行うことを特徴とし
た印刷品質検査方法。1. A print quality inspection for comparing print image data sequentially captured by a camera of a detection unit with reference value data that has been captured in advance to detect a print defect and determine quality of print quality. In the method, the image data of the printing paper surface sequentially captured by the camera of the detection unit is temporally averaged to calculate estimated value data, and the estimated value data is compared with the reference value data previously captured,
If the estimated value data is normal, it is determined to be a normal pixel, and if abnormal, the next step compares the image data from the detection unit with the reference value data and if the image data from the detection unit is normal. For example, the print quality inspection method is characterized in that it is determined to be a normal pixel, and if it is abnormal, it is determined to be a defective pixel and a paper ejection process is performed.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7021531A JPH08216377A (en) | 1995-02-09 | 1995-02-09 | Inspecting method of printing quality |
| DE19604241A DE19604241C2 (en) | 1995-02-09 | 1996-02-06 | Device for checking the print quality |
| US09/045,099 US6081608A (en) | 1995-02-09 | 1998-03-20 | Printing quality examining method |
| US09/496,846 US6373966B1 (en) | 1995-02-09 | 2000-02-02 | Print quality examining apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7021531A JPH08216377A (en) | 1995-02-09 | 1995-02-09 | Inspecting method of printing quality |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08216377A true JPH08216377A (en) | 1996-08-27 |
Family
ID=12057547
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7021531A Pending JPH08216377A (en) | 1995-02-09 | 1995-02-09 | Inspecting method of printing quality |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08216377A (en) |
-
1995
- 1995-02-09 JP JP7021531A patent/JPH08216377A/en active Pending
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20020611 |